Double Copy for Celestial Amplitudes

Celestial amplitudes which use conformal primary wave functions rather than plane waves as external states offer a novel opportunity to study properties of with manifest covariance and give insight into potential holographic celestial field theory at the null boundary asymptotically flat space. Since translation invariance is obscured in basis, features that heavily rely on it appear be lost. Among these are remarkable relations between gauge gravity known double copy. Nevertheless, reflecting fundamental aspects perturbative regime quantum expected survive change basis. Here we show there exists well-defined procedure for This requires generalization usual squaring numerators entails first promoting them generalized differential operators acting then them. We demonstrate this three- four-point an argument its validity all multiplicities.